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<div class="title">counted_ptr.h</div>  </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160; </div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="keyword">namespace </span>resumef</div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;{</div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00009"></a><span class="lineno"><a class="line" href="structresumef_1_1counted__ptr.html">    9</a></span>&#160;    <span class="keyword">struct </span><a class="code" href="structresumef_1_1counted__ptr.html">counted_ptr</a></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;    {</div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;        <a class="code" href="structresumef_1_1counted__ptr.html#ad3969379af7311183c1c11d13f6da9f3">counted_ptr</a>() noexcept = <span class="keywordflow">default</span>;</div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160; </div>
<div class="line"><a name="l00019"></a><span class="lineno"><a class="line" href="structresumef_1_1counted__ptr.html#ad466495cf5a6056e326a923558676ccd">   19</a></span>&#160;        <a class="code" href="structresumef_1_1counted__ptr.html#ad466495cf5a6056e326a923558676ccd">counted_ptr</a>(<span class="keyword">const</span> <a class="code" href="structresumef_1_1counted__ptr.html">counted_ptr</a>&amp; cp) : _p(cp._p)</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;        {</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;            _lock();</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;        }</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160; </div>
<div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="structresumef_1_1counted__ptr.html#ab752ffdd40c7ab1be06e7662488d8e24">   27</a></span>&#160;        <a class="code" href="structresumef_1_1counted__ptr.html#ab752ffdd40c7ab1be06e7662488d8e24">counted_ptr</a>(T* p) : _p(p)</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;        {</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;            _lock();</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;        }</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160; </div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="structresumef_1_1counted__ptr.html#a8b6f5332dd4754c22970f7e5406c6233">   35</a></span>&#160;        <a class="code" href="structresumef_1_1counted__ptr.html#a8b6f5332dd4754c22970f7e5406c6233">counted_ptr</a>(<a class="code" href="structresumef_1_1counted__ptr.html">counted_ptr</a>&amp;&amp; cp) noexcept</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;        {</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;            std::swap(_p, cp._p);</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;        }</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160; </div>
<div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="structresumef_1_1counted__ptr.html#a8a5bff0a86d41b1ab50f817be770573a">   43</a></span>&#160;        <a class="code" href="structresumef_1_1counted__ptr.html">counted_ptr</a>&amp; <a class="code" href="structresumef_1_1counted__ptr.html#a8a5bff0a86d41b1ab50f817be770573a">operator=</a>(<span class="keyword">const</span> <a class="code" href="structresumef_1_1counted__ptr.html">counted_ptr</a>&amp; cp)</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        {</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;            <span class="keywordflow">if</span> (&amp;cp != <span class="keyword">this</span>)</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;            {</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;                <a class="code" href="structresumef_1_1counted__ptr.html">counted_ptr</a> t = cp;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;                std::swap(_p, t._p);</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;            }</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;            <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;        }</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160; </div>
<div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="structresumef_1_1counted__ptr.html#af6a044ce1cdecc3a2650f16f445de2d4">   56</a></span>&#160;        <a class="code" href="structresumef_1_1counted__ptr.html">counted_ptr</a>&amp; <a class="code" href="structresumef_1_1counted__ptr.html#af6a044ce1cdecc3a2650f16f445de2d4">operator=</a>(<a class="code" href="structresumef_1_1counted__ptr.html">counted_ptr</a>&amp;&amp; cp) noexcept</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        {</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;            <span class="keywordflow">if</span> (&amp;cp != <span class="keyword">this</span>)</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;                std::swap(_p, cp._p);</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;            <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;        }</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160; </div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="structresumef_1_1counted__ptr.html#a825f25bf4975e015f859e8ba29bd85b6">   66</a></span>&#160;        <a class="code" href="structresumef_1_1counted__ptr.html#a825f25bf4975e015f859e8ba29bd85b6">~counted_ptr</a>()</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        {</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;            _unlock();</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;        }</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160; </div>
<div class="line"><a name="l00074"></a><span class="lineno"><a class="line" href="structresumef_1_1counted__ptr.html#aa22f547da8b8e79b476ee83e4a790dba">   74</a></span>&#160;        T* <a class="code" href="structresumef_1_1counted__ptr.html#aa22f547da8b8e79b476ee83e4a790dba">operator-&gt;</a>() const noexcept</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;        {</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;            <span class="keywordflow">return</span> _p;</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;        }</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160; </div>
<div class="line"><a name="l00082"></a><span class="lineno"><a class="line" href="structresumef_1_1counted__ptr.html#a9f6757dac685431f2ae561a58c502d1f">   82</a></span>&#160;        T* <a class="code" href="structresumef_1_1counted__ptr.html#a9f6757dac685431f2ae561a58c502d1f">get</a>() const noexcept</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;        {</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;            <span class="keywordflow">return</span> _p;</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;        }</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160; </div>
<div class="line"><a name="l00090"></a><span class="lineno"><a class="line" href="structresumef_1_1counted__ptr.html#aa33f9e7d3ee850bed6dbefd40252a899">   90</a></span>&#160;        <span class="keywordtype">void</span> <a class="code" href="structresumef_1_1counted__ptr.html#aa33f9e7d3ee850bed6dbefd40252a899">reset</a>()</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;        {</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;            _unlock();</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;        }</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    <span class="keyword">private</span>:</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;        <span class="keywordtype">void</span> _unlock()</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        {</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;            <span class="keywordflow">if</span> (_p != <span class="keyword">nullptr</span>)</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;            {</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;                <span class="keyword">auto</span> t = _p;</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;                _p = <span class="keyword">nullptr</span>;</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;                t-&gt;unlock();</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;            }</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;        }</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;        <span class="keywordtype">void</span> _lock(T* p)</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;        {</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;            <span class="keywordflow">if</span> (p != <span class="keyword">nullptr</span>)</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;                p-&gt;lock();</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;            _p = p;</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;        }</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;        <span class="keywordtype">void</span> _lock()</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;        {</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;            <span class="keywordflow">if</span> (_p != <span class="keyword">nullptr</span>)</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;                _p-&gt;lock();</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;        }</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;        T* _p = <span class="keyword">nullptr</span>;</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;    };</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160; </div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T, <span class="keyword">typename</span> U&gt;</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">bool</span> operator == (<span class="keyword">const</span> counted_ptr&lt;T&gt;&amp; _Left, <span class="keyword">const</span> counted_ptr&lt;U&gt;&amp; _Right)</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;    {</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;        <span class="keywordflow">return</span> _Left.get() == _Right.get();</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;    }</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">bool</span> operator == (<span class="keyword">const</span> counted_ptr&lt;T&gt;&amp; _Left, std::nullptr_t)</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    {</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;        <span class="keywordflow">return</span> _Left.get() == <span class="keyword">nullptr</span>;</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    }</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">bool</span> operator == (std::nullptr_t, <span class="keyword">const</span> counted_ptr&lt;T&gt;&amp; _Left)</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;    {</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;        <span class="keywordflow">return</span> _Left.get() == <span class="keyword">nullptr</span>;</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;    }</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">bool</span> operator != (<span class="keyword">const</span> counted_ptr&lt;T&gt;&amp; _Left, std::nullptr_t)</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;    {</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;        <span class="keywordflow">return</span> _Left.get() != <span class="keyword">nullptr</span>;</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;    }</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">bool</span> operator != (std::nullptr_t, <span class="keyword">const</span> counted_ptr&lt;T&gt;&amp; _Left)</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    {</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;        <span class="keywordflow">return</span> _Left.get() != <span class="keyword">nullptr</span>;</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;    }</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;}</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160; </div>
</div><!-- fragment --></div><!-- contents -->
<div class="ttc" id="astructresumef_1_1counted__ptr_html_ab752ffdd40c7ab1be06e7662488d8e24"><div class="ttname"><a href="structresumef_1_1counted__ptr.html#ab752ffdd40c7ab1be06e7662488d8e24">resumef::counted_ptr::counted_ptr</a></div><div class="ttdeci">counted_ptr(T *p)</div><div class="ttdoc">通过裸指针构造一个计数指针。</div><div class="ttdef"><b>Definition:</b> counted_ptr.h:27</div></div>
<div class="ttc" id="astructresumef_1_1counted__ptr_html_af6a044ce1cdecc3a2650f16f445de2d4"><div class="ttname"><a href="structresumef_1_1counted__ptr.html#af6a044ce1cdecc3a2650f16f445de2d4">resumef::counted_ptr::operator=</a></div><div class="ttdeci">counted_ptr &amp; operator=(counted_ptr &amp;&amp;cp) noexcept</div><div class="ttdoc">移动赋值函数。</div><div class="ttdef"><b>Definition:</b> counted_ptr.h:56</div></div>
<div class="ttc" id="astructresumef_1_1counted__ptr_html_ad3969379af7311183c1c11d13f6da9f3"><div class="ttname"><a href="structresumef_1_1counted__ptr.html#ad3969379af7311183c1c11d13f6da9f3">resumef::counted_ptr::counted_ptr</a></div><div class="ttdeci">counted_ptr() noexcept=default</div><div class="ttdoc">构造一个无内容的计数指针。</div></div>
<div class="ttc" id="astructresumef_1_1counted__ptr_html_a8b6f5332dd4754c22970f7e5406c6233"><div class="ttname"><a href="structresumef_1_1counted__ptr.html#a8b6f5332dd4754c22970f7e5406c6233">resumef::counted_ptr::counted_ptr</a></div><div class="ttdeci">counted_ptr(counted_ptr &amp;&amp;cp) noexcept</div><div class="ttdoc">移动构造函数。</div><div class="ttdef"><b>Definition:</b> counted_ptr.h:35</div></div>
<div class="ttc" id="astructresumef_1_1counted__ptr_html_a9f6757dac685431f2ae561a58c502d1f"><div class="ttname"><a href="structresumef_1_1counted__ptr.html#a9f6757dac685431f2ae561a58c502d1f">resumef::counted_ptr::get</a></div><div class="ttdeci">T * get() const noexcept</div><div class="ttdoc">获得管理的state指针。</div><div class="ttdef"><b>Definition:</b> counted_ptr.h:82</div></div>
<div class="ttc" id="astructresumef_1_1counted__ptr_html"><div class="ttname"><a href="structresumef_1_1counted__ptr.html">resumef::counted_ptr</a></div><div class="ttdoc">专用与state的智能计数指针，通过管理state内嵌的引用计数来管理state的生存期。</div><div class="ttdef"><b>Definition:</b> counted_ptr.h:9</div></div>
<div class="ttc" id="astructresumef_1_1counted__ptr_html_aa33f9e7d3ee850bed6dbefd40252a899"><div class="ttname"><a href="structresumef_1_1counted__ptr.html#aa33f9e7d3ee850bed6dbefd40252a899">resumef::counted_ptr::reset</a></div><div class="ttdeci">void reset()</div><div class="ttdoc">重置为空指针。</div><div class="ttdef"><b>Definition:</b> counted_ptr.h:90</div></div>
<div class="ttc" id="astructresumef_1_1counted__ptr_html_aa22f547da8b8e79b476ee83e4a790dba"><div class="ttname"><a href="structresumef_1_1counted__ptr.html#aa22f547da8b8e79b476ee83e4a790dba">resumef::counted_ptr::operator-&gt;</a></div><div class="ttdeci">T * operator-&gt;() const noexcept</div><div class="ttdoc">重载指针操作符。</div><div class="ttdef"><b>Definition:</b> counted_ptr.h:74</div></div>
<div class="ttc" id="astructresumef_1_1counted__ptr_html_a8a5bff0a86d41b1ab50f817be770573a"><div class="ttname"><a href="structresumef_1_1counted__ptr.html#a8a5bff0a86d41b1ab50f817be770573a">resumef::counted_ptr::operator=</a></div><div class="ttdeci">counted_ptr &amp; operator=(const counted_ptr &amp;cp)</div><div class="ttdoc">拷贝赋值函数。</div><div class="ttdef"><b>Definition:</b> counted_ptr.h:43</div></div>
<div class="ttc" id="astructresumef_1_1counted__ptr_html_a825f25bf4975e015f859e8ba29bd85b6"><div class="ttname"><a href="structresumef_1_1counted__ptr.html#a825f25bf4975e015f859e8ba29bd85b6">resumef::counted_ptr::~counted_ptr</a></div><div class="ttdeci">~counted_ptr()</div><div class="ttdoc">析构函数中自动做一个计数减一操作。计数减为0，则删除state对象。</div><div class="ttdef"><b>Definition:</b> counted_ptr.h:66</div></div>
<div class="ttc" id="astructresumef_1_1counted__ptr_html_ad466495cf5a6056e326a923558676ccd"><div class="ttname"><a href="structresumef_1_1counted__ptr.html#ad466495cf5a6056e326a923558676ccd">resumef::counted_ptr::counted_ptr</a></div><div class="ttdeci">counted_ptr(const counted_ptr &amp;cp)</div><div class="ttdoc">拷贝构造函数。</div><div class="ttdef"><b>Definition:</b> counted_ptr.h:19</div></div>
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